What is rubber hardness?

Hardness measurement is an important item to determine the properties of rubber, elastomer and plastic products. With easy operation and quick measurement, hardness tester is widely used.

Basic structure

As illustrated above, the hardness gauge measures the hardness of the test specimen by pressing the indenter in a specified shape onto the surface of the test specimen, applying the spring deformation force, and reading the extent to which the tip of the indenter protrudes beyond the face of the pressure base.

Measured value

As discussed above, a durometer incorporates an indicator to allow readings of the extent of protrusion of the probe beyond the face of the pressure foot, giving 0 for maximum protrusion (0 displacement) and 100 for 0 protrusion, with an equidistant scale. The load applied to the test specimen through the probe is the bending force of the spring and is therefore constant, varying linearly over the range 0 to 100.

Unlike in the case of other property values, there is no specific unit for hardness measurement values. Therefore, it is not sufficient to simply describe the hardness value as “50 (degrees)”; the value must be clearly specified, for example, “Hardness 50 degrees, Shore A, according to JIS K 6253-3”. Furthermore, each standard prescribes rules for describing hardness in various ways, as the table below shows.

Name, type and description rules of each standard

(JIS K 6301 was abolished in August 1998)

rubber hardness tester TECLOCK GS SERIES rubber and plastic hardness tester

Measurement instructions

1. Temperature and humidity conditions affect the measurement.
2. The surface of the test specimen shall be flat and smooth, without any ripples or warping.
3. Measuring the same point multiple times will reduce the measurement. When measuring a sample at multiple points, the measuring point must be at least 6 mm from the previous measuring point and at least 12 mm from any edge, as specified in national and international standards.
4. The rate at which the durometer applies pressure to the specimen affects the measurement; the faster the rate, the higher the reading and the slower the rate, the lower the reading. The compression should be carried out at the specified rate as much as possible. This should be particularly noted where the specimen has a drop in measurement immediately after compression.
5. The sample for type A hardness tester must be thicker than 6mm.

hardness tester ASKER DUROMETER TYPE A, B, C, D

Check

Can check the operating status of Durometer using an elongation tester to check the height of the gauge as well as a load tester to check the spring load.

CONTACT:

SEMIKI Measuring Equipment Company Limited
Email: [email protected]
Phone: +84 9797 61016